Draw bench



Feb. 3, 1942. E. J. MCILVRIED DRAW BENCH 3 Sheets-Sheet l ATTORNEY5Filed Dec. 9, 1940 I QM.

Lil l1 Feb. 3, 1942. E. J. MCILVRIED DRAW BENCH Filed D60. 9, 1940 3Sheets-Sheet 2 Illllli R w LN m m M6 [W W M paratus embodying myinvention;

Patented Feb. 3, 1942 UNITED STATE DRAW BENCH Edwin J. Mcllvried, Stow,Ohio, assignor to The Vaughn Machinery Company, Cuyahoga Falls, Ohio, acorporation of Ohio Application December 9, 1940, Serial No. 369,315

Claims.

This invention relates to drawing apparatus and more particularly todrawing apparatus of the kind known as a draw bench and which has acarriage adapted to travel away from and toward a die support.

An object of the invention is to provide an improved draw bench havingnovel means by which the carriage can be quickly returned after adrawing operation and can be brought to a stop without likelihood ofcolliding with the die support.

Another object of my invention is to provide improved drawing apparatus,of the character mentioned, in which the return movement 01 the carriageis limited or stopped by the tautening of a length of cable having oneend connected with the carriage and its other end anchored.

Still another object of my invention is to provide improved drawingapparatus, of the type referred to, wherein the means for returning thecarriage after a drawing-operation involves the use of a winding drumand a novel arrangement of cables, one of which has one end connectedwith the carriage and its other end anchored on the drum and is of alength to be tautened by the return movement for stopping the carriagejust short of engagement with the die support.

A further object of my invention is to provide improved drawingapparatus of the character mentioned, which contemplates the use of afor slowing the return movement of the ear winding drum and a pair ofcables for returning the carriage and in which, one of the cables isanchored to'the drum and is of a length to limit the return movement'andthe other cable extends over a yieldable take-up device in passing fromthe drum to the carriage. 7 I

The invention may be further briefly sum-' marized vas consisting incertain novel combinations and arrangements of parts hereinafter'described and particularly set out in the appended In the accompanyingsheets of drawings,

Fig. l-isa side elevation showing drawing ap- Fig. 2 is aplan Viewthereof;

Fig. 3 is a partial plan view, with portions in section, showing thewinding means for taking up the v fcablesused in returning the carriage;

, 41s a vertical sectional view taken throughthe drum' and its drivingmeans substantially as indicated by line H of Fig. 3; I

Fig; 5 is an elevation, with portions broken Fig. 6 is a side elevationshowin a yieldable take-up device for removing slack from the cables;

Fig. 7 is an end view Of the take-up device, with portions thereof shownin section; and

Fig. 8 is a partial sectional view taken through tliie winding drum asindicated by line 88 of F g. 3.

Further reference will now be made to the accompanying drawings for thepurpose of describing in detail the construction and operation of oneembodiment of my improved drawing apparatus, but it will be understood,of course, that the invention is not limited to the particular apparatushere disclosed since it may be embodied in various other forms andarrangements of similar apparatus.

In Figs. 1 and 2 I show a draw bench It to which my novel carriagereturn means has been applied. The draw bench shown in this instancecomprises anv elongated frame I I havin a die mount or support I2adjacent one end thereof and also having a carriage l3 which is movablealong the frame in a direction away from the die support during adrawing operation and toward the die support during the return movementfollowing the drawing operation. The carriage l3 may have a grippingmeans I4 thereon for gripping the leading endv of a work piece, such asthe metal bar l5 shown -in this instance, and the die support l2 mayhave. a die. l6 thereon through which the bar IS/is drawn .by themovement of the carriage.

' Drawing movement, that is, movement away from the die support l2, maybe imparted to the carriage 13 by any suitable means. In the apparatushere illustrated a traveling chain I1 is employed for this purpose andthe carriage I3 is provided with a hook l8 which is engageable in thechain for connecting the carriage therewith. The chain I! mayextendaround sprockets 20 and 2| provided adjacent the ends ofthe frameII and may be propelled by suitable driving means connected with theshaft 22 of the sprocket 20. This driving means may comprise an electricmotor 23'. which is connected with the shaft 22 through a reduction gear24. At the end of the outward or drawing movement of the carriage I3,the gripping jaws i4 release the work piece l5 and the hook I8 isdisconnected from the chain, as by engagement of the carriage with theslopinghousing 25, whereupon away, showing means for actuating limitswitches the carriage is ready to be returned to a point adjacent thedie'support ing operation.

Inasmuch as the draw bench "may be of considerable length, it isdesirable to return the carriage I3 rapidly so as to save time, butreturning the carriage rapidly increases the danger of damage to theapparatus due to collision of the carriage with the die support l2. Thenovel carriage return means which I have provided and which will now bedescribed in 'detail enables the carriage [3 to be returned rapidly andat the same time substantially eliminates all likelihood of the carriagecolliding with the die support. This carriage return means comprises awinding drum 21 and a pair of cables 23 and 29 connected with thecarriage l3. As will be presently, explained more in detail, the cable23 is arranged to be taken up by the drum 21 for imparting the returnmovement to the carriage. The cable 23 has one end connected with thecarriage l3 and its other end suitably anchored andis of a length suchthat when the carriage arrives at a point adjacent the die support l2,as shown in Fig. 1, this cable will be tautened and will stop the'returnmovement thereby preventing the carriage from colliding with the diesupport. The outer end of the cable 29 is anchored preferably, thoughnot necessarily, by being connected with the winding drum 21.

In the arrangement here shown for the carriage return means, the cable28 extends longitudinally beneath the frame II and around an idlerpulley or sheave 30 and has its inner end connected with the carriage,as indicated at 3|. The other or outer end of this cable passes on to l2for the next draw- 1 the winding drum 21 at the'underside thereof and isanchored on the drum adjacent one end of the winding groove 32, asindicated at 33. The cable 22 extends longitudinally above the frame IIat one side of the chain 11 and. has its inner end connected with thecarriage l3, as indicated at 34. The outer end of this cable passes onto the winding drum 21 at the top' thereof, that is, at the sideopposite the cable 28 and is anchored on the drum at the opposite end ofthe winding @5 groove 32, as indicated at 35.

With the cable arrangement just described, it will be seen that when thewinding drum 21 is rotated in a clockwise direction, as seen in Fig.1,the cable 28 will be wound onto the drum and at the same time the cable28 will be unwound or payed out. During the drawing operation inmovement of the carriage l3. In the present embodiment I show for thispurpose a drive shaft 33 to which the drum21 is keyed or otherwiseconnected, and an electric motor 31 drivingly connected with said shaftby means of the pinion switch 42 which controls the energization of themotor 31- and a limit switch 43 which controls the operation of a brake44, such as a magnetic brake, arranged to act on the shaft of the motor31. The limit switches 42 and 43 may be actuated at the proper time byany suitable means, such as earns 45 and 43, carried by a rotatablewheel '41. This wheel may be driven in timed relation to the rotation ofthe winding drum 21 and the return movement of the carriage I3 bysuitable means such as a pinion 43 mounted on a projection or extension360 of the shaft 3 and meshing with a gear 49 which is formed on orconnected with the wheel 41. l a

The wheel 41 and the gearing for driving the same are so constructed andarranged that the wheel will make only one revolution, or slightly lessthan one revolution, during the return travel V of the carriage l3.

The cams 45 and 48 are located on the wheel 41 so that when the carriagel3 approaches the die support l2, but is still some distance therefrom,the cam 45 will trip the arm III of the limit switch 42 to therebydeenergize or partially deenergize the motor 31 and this will result ina slowing down of the carriage. As the carriage moves closer to the diesupport, the cam 48 engages the trip arm II thereby actuating the limitswitch 43 and causing the brake 44 to be applied. The application of thebrake 44 slows the return movement of the carriage I3 so that by thetime the cable 23 is fully unwound from the drum 21 and is stretchedtaut. the speed of the carriage will be relatively slow and the cablewill notbe subjected to a violent jerk. If desired the cams 4B and 48may be individually adjustable on the wheel 41 to permit of someadjustment of the timing of. the actuation of the switches 42 and 43. Tothis end the wheel .may have circumferential T-slots 41a in which thecams can be shifted to the desired setting.

When the outer end of the carriage 29 is anchored on the winding drum21, as indicated at 3!, the connection between the cable and drum may beformed by providing the latter with a in the opposite orcounterclockwise direction by 00 tep or recess 52, as shown in Fig. 8,and the end a power means to be presently described causing the cable 28to be taken up or wound on the drum port 12, this cable will be entirelyunwound from the drum and will become tautened and will limit or stopfurther return movement of the carriage thus-preventing collision of thesame against the die support.

The winding drum 21 may bedriven by any suitable power means for causingthe return 1| of the cable may be provided with an eye I3 through whichan anchor bolt 54 extends. The step or recess 52 is located adjacent theend of the winding groove 32 so that the portion of the cable extendingaway from the eye 53 will readily engage in the groove when the drum 2]is rotated in a direction to wind up the cable 29.

It will be seen from Fig. 8 that when aportion of the cable 20 is woundon the drum 21, the cable will extend away from the drum alongia linewhich is substantially tangent to thedrum surface, as indicated in dotand dash lines, but when the cable has been fully unwound from the drum,as shown in full lines, the eye 33 occupies a position substantiallyopposite the drum shaft 98 and the cable is no longer tangent to thedrum. The angular movement of the anchor bolt 54 from its broken lineposition to its full line position. as indicated in Fig. 8, thus causesa sudden increase in the rate at which the cable 29 is being payed outand would result in a slackening oi the cable if some means were notprovided to compensate for this effect. To prevent such a suddenslackening of the cable 29, I provide a yieldable take-up device 56adjacent the winding drum 2! and over which the cable 28 passes. Thistake-up device may comprise a suitable frame 51 having a pair of fixedsheaves or idler pulleys 58 and 59 thereon and a travelingor movablesheave 60. The cable 28 passes from the winding drum 2'! around themovable sheave 60 and then around the stationary sheave 58 beforepassing forward to the carriage I3. The sheave 59 serves merely as afair lead or guide over which the cable 29 passes. A guard 6| may belocated adjacent the sheave 59 to retain the cable 29 thereon.

The movable or traveling sheave 60 may be carried by a swinging lever orarm 52 having a pivotal connection 63 on the frame and hav- 1 ing itsfree end guided by the arcuate slot 63a.

A compression spring 64 is arranged between the swinging lever 62 and anarm or bracket 65 of the frame so that a pulling force applied to thecable 28 will tend to compress the spring and any sudden tendency foreither the cable 28 or the cable 29 to slackenwill be quickly taken upby the expansive action of the spring 64 moving the swinging lever 62and the sheave 60 away from the sheave 58. Since both of the cables 28and 29 are connected with the drum 2] and with the carriage l3 andthe'latter is movable along the track, it will be seen that the springactuated sheave 60 over which the cable 28 passes will serve to take upslack in both cables. If slack should occur in the cable 29, the spring56 acting through the cable 28 would move the carriage along its track adistance suflicient to take up such slack in the cable 29.

Oneend of the spring 64 may bear against a seat 66 which is pivoted tothe arm 65 and the other end may bear against a seat 61 which is pivotedto the swinging lever 62. For maintaining the seats 66 and 61 in properalignment with each other, I may provide the seat 66 with an extension68 having spaced bearings 69 and I0 thereon and may provide the seat 61with an extension in the form of a rod H which is slidable in thebearings 69 and 10. As shown in. Fig. 6 the stationary sheave 58 may bemounted in an inclined position so that the portion of the cable 28extending forward to the carriage I3 may clear the movable sheave 60.

From the foregoing description and the accompanying drawings, it willnow be readily understood that I have provided an improved draw benchhaving novel carriage return means which permits the carriage to berapidly returned after a drawing operation and insures a positivestopping of the carriage without colliding with the die support.

While I have illustrated and described my improved draw bench in a moreor less detailed manner, it will be understood, of course, that I do notwish to be limited to the particular details of construction andarrangements of parts herein disclosed, but regard my invention asincludingsuch changes and modifications as do not constitute a departurefrom the spirit of the invention and the scope of the appended claims.

Having thus described my invention, I claim: 1, In a draw bench having adie mount and a carriage movable relative thereto, means for moving thecarriage away from the. die mount during a drawing operation, means forreturning the carriage toward the die mount after a drawing operation,and means for limiting the return movement of the carriage comprising acable having one end connected with the carriage and its other endanchored.

2. In combination with a draw bench'having a die mount and a carriagemovable relative to said die mount, means for moving the carriage awayfrom the die mount during a drawing operation, means for returning thecarriage comprising a cable connected therewith and a winding drum fortaking up the. cable, and means for limiting the return movement of thecarriage comprising a cable having one end connected with the carriageand its other end anchored.

3. In a draw bench having a die mount and a carriage movable relativethereto, means for moving the carriage away from the die mount during adrawing operation, means for returning the carriage toward the die mountafter a drawing operation, switch-controlled means for slowing thereturn movement of the carriage as it approaches the die mount, andmeans for limiting such return movement comprising a cable having oneend connected with the carriage and its other end anchored.

4. In a draw bench having a die mount and a carriage movable relativethereto, means for moving the carriage away from the die mount dufring adrawing operation, a winding drum, means for driving said drum, a cableconnected with the carriage and arranged to be taken up by the drum forreturning the carriage toward the-die mount, and a length of cablehaving its drum being rotatable in the reverse direction to' pay outsaid cable during the drawing operation, and a second cable having itsends con- I nected respectively with said carriage and drum said cablesand over and being of a length to limit the return movement of thecarriage, said second cable being arranged to be taken up by said drumduring its reverse rotation and to be unwound therefrom during saidreturn movement of the carriage.

6. In a draw bench having a die mount and a carriage movable relativethereto, means for moving the carriage away from the die mount during adrawing operation, a winding drum. means for driving said drum, a cableconnected with the carriage and arranged to be taken up by said drum forreturning the carriage toward the die mount, a second cable having oneend connected with the carriage and its other end anchored on the drumand being of a length to limit the return movement of the carriage, andyieldable take-up means adapted to take up slack in which thefirst-mentioned cable passes.

I. In apparatus oi the character described,

an elongated frame having a die support adia! cent one end thereof, adie on said support, a carriage movable along said frame and providedwith a work gripping means, means for moving the carriage away from saiddie support for drawing work through said die, a winding drum adjacentthe other end of said frame, a sheave adjacent said one end of theframe, a cable extending around said sheaveand having its ends connectedwith said carriage and said winding drum, means for driving .said drumfor takup said cable and returning the carriage toward the die support,and a second cable. having one end anchored and its other end connectedwith said carriage and being of a length to stop the return movement ofthe carriage just short of engagement of the carriage with the diesupport 8. Inapparatus of the character described, an elongated framehaving a die support adjacent one end thereof, a die on said support, acarriage movable along said frame and provided with a work grippingmeans, means for moving the carriage away from said die support fordrawing work through said die, a winding drum adjacent the other end 01'said frame, a sheave adjacent said one end of the frame, a cableextending around said sheave and having its ends connected with saidcarriage and said winding drum, means for driving said drum for takingup said cable and returning the carriage toward the die support,switch-controlled means for slowing the return movement of the carriageas it approaches the die support, and means for stopping such returnmovement just short of en- 'riage and the other end anchored on the drumand being of a length such that it will be fully unwound from the drumand tautened to check the return movement of the carriage before thelatter reaches the die support.

10. In combination with a die support and a carriage movable away fromthe die support during a drawing stroke and toward the die supportduring the return stroke, a traveling chain for propelling the carriageduring the drawing stroke,

a winding drum spaced from said die support, a cable connected with saidcarriage and adapted to be taken up by the drum for propelling thecarriage during its return stroke, and a second cable for limiting thereturn stroke to prevent the carriage from striking the die support,said second cable having one end connected with the carriage and theother end anchored on the drum and being of a length such that it willbe fully unwound from the drum and tautened to check the return movementof the carriage before the latter reaches the die support.

EDWIN J. McILVRIED.

